四川盆地中三叠世雷口坡期障壁型碳酸盐岩台地沉积特征及有利储集相带分布
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摘要
雷口坡组是四川盆地重要的含气层系。根据露头、岩心、分析化验、录井、测井、地震等资料的综合分析认为,受古地质背景和海平面升降旋回的控制,四川盆地在中三叠世雷口坡期是一个水体浅、盐度大、范围广阔的障壁型碳酸盐岩台地,由于受周边古隆起和盆内水下古隆起障壁作用的限制,台地内外海水交流不畅,台地内水动力条件偏弱、生物不繁盛、干旱气候为主是其基本特征。雷口坡组在平面上表现为自西向东台地边缘—潟湖边缘坪(台内滩)—潟湖—潟湖边缘坪(台内滩)—潟湖—混积潮坪的沉积相展布特征,纵向上表现为蒸发岩、白云岩与石灰岩互层的演化特征。绘制了盆地雷口坡期岩相发育演化图。预测盆地西部龙门山白云石化台缘滩、中部泸州—开江水下古隆起及其周边的古地貌高处台内滩和潟湖边缘白云岩坪是有利的储集岩相分布区。
Middle Triassic Leikoupo Formation is one of the important gas-bearing strata in Sichuan Basin.On the basis of comprehensive analysis of outcrops,drilled cores,laboratory,well logging and seismic data,it is shown that under control of palaeogeologic setting and eustatic fluctuations,Sichuan Basin was a water-shallow,high salty and wide barriored carbonate platform confined by palaeo-uplifts during Middle Triassic Leikoupo age.The platform was characterized basically by developing intrabasinal barriers,weak hydrodynamism,poor creature and arid climate.Leikoupo Formation beheaves an evolutional distribution of platform edge microfacies,lagoon microfacies,lagoon edge microfacies(platform interior shallow microfacies),lagoon microfacies,lagoon edge microfacies(platform interior shallow microfacies) to transitional microfacies successively from west to east in lateral and the evaporate rock,dolostone interbedded with limestone in longitudinal in the barriered platform.Some Middle Triassic Leikoupo lithofacies development and evolution maps are drawn.It is predicted that the favorable lithofacies for reservoirs develop in the peripheral regions of the barriors including the Longmen Shan Uplift in the west of the basin,and the Luzhou and Kaijiang Uplifts in the south and east of the basin.
Middle Triassic Leikoupo Formation is one of the important gas-bearing strata in Sichuan Basin.On the basis of comprehensive analysis of outcrops,drilled cores,laboratory,well logging and seismic data,it is shown that under control of palaeogeologic setting and eustatic fluctuations,Sichuan Basin was a water-shallow,high salty and wide barriored carbonate platform confined by palaeo-uplifts during Middle Triassic Leikoupo age.The platform was characterized basically by developing intrabasinal barriers,weak hydrodynamism,poor creature and arid climate.Leikoupo Formation beheaves an evolutional distribution of platform edge microfacies,lagoon microfacies,lagoon edge microfacies(platform interior shallow microfacies),lagoon microfacies,lagoon edge microfacies(platform interior shallow microfacies) to transitional microfacies successively from west to east in lateral and the evaporate rock,dolostone interbedded with limestone in longitudinal in the barriered platform.Some Middle Triassic Leikoupo lithofacies development and evolution maps are drawn.It is predicted that the favorable lithofacies for reservoirs develop in the peripheral regions of the barriors including the Longmen Shan Uplift in the west of the basin,and the Luzhou and Kaijiang Uplifts in the south and east of the basin.
引文
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[2]林良彪,陈洪德,朱利东,等.川东嘉陵江组—雷口坡组层序岩相古地理[J].成都理工大学学报,2010,37(4):446-451.
[3]李凌,谭秀成,周素彦,等.四川盆地雷口坡组层序岩相古地理[J].西南石油大学学报,2012,34(4):13-22.
[4]翟光明.中国石油地质志卷十:四川油气区[M].北京:石油工业出版社,1989.
[5]陈洪德,侯明才,刘文均,等.海西—印支期中国南方的盆地演化与层序格架[J].成都理工大学学报:自然科学版,2004,31(6):629-635.
[6]辛勇光,谷明峰,周进高,等.四川盆地雷口坡末期古岩溶特征及其对储层的影响——以龙岗地区雷口坡组四段为例[J].海相油气地质,2012,17(1):73-78.
[7]李晓清,汪泽成,张兴为,等.四川盆地古隆起特征及对天然气的控制作用[J].石油与天然气地质,2001,22(4):347-351.
[8]林耀庭,姚有成,康正华,等.四川宣达盐盆富钾富矿卤水地球化学特征及资源意义研究[J].盐湖研究,2004,12(1):8-18.
[9]许靖华,何超祥,吴应林,等.我国西南早三叠世间“绿豆岩”等时面上、下的碳、氧稳定同位素地球化学[J].成都地质矿产研究所所刊第4号,1983:1-12.
[10]朱井泉.四川华蓥山三叠系含膏盐段的碳氧同位素特征及其意义[J].岩石学报,1990,11(4):67-74.
[11]张廷山,陈晓慧,姜照勇,等.泸州古隆起对贵州赤水地区早、中三叠世沉积环境和相带展布的控制[J].沉积学报,2008,26(4):583-591.
[12]韩克猷.川东开江古隆起大中型气田的形成及勘探目标[J].天然气工业,1995,15(4):1-4.
[13]四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1991.
[14]沈安江,周进高,辛勇光等.四川盆地雷口坡组白云岩储层类型及成因[J].海相油气地质,2008,13(4):19-28.
[15]周进高,辛勇光,谷明峰,等.四川盆地中三叠统雷口坡组天然气勘探方向[J].天然气工业,2010,30(12):16-19.
①曾学思,田端孝,崔德树,等.四川盆地西部中三叠统雷口坡组岩相及其与油气水关系的探讨(R).国家地质总局第二普查勘探大队,1978.
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